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2022 Midwest Vegetable Guide

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Cucurbit Crops – Diseases 132 Midwest Veg Guide 2022 breakdown tissue and displace nematodes is an important method to prevent nematode build-up. Anaerobic soil disinfestation (ASD) is an effective sterilization method for greenhouse and high tunnel soils that contain nematodes. Pesticide K-PAM HL (5.8L) (metam potassium) Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | 30-62 gals. per acre. Use high rates on muck, and lower rates on sands. In the fall, when soil at 6 inches is above 50 F and moist, place K-PAM HL or Sectagon K54 about 8 inches beneath the surface through shank-injectors, or broadcast sprayers directly in front of tillage tools to bury it. Seal with soil packing or irrigation. Or, in the spring, it can be applied through drip irrigation under unperforated plastic beds. Before planting, allow product to dissipate for 1 week for every 10 gals. per acre plus 1 more week. REI: 5-day. IRAC 08F, FRAC M03, HRAC NC. RUP. Nimitz (4EC) (fluensulfone) Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | 3.5-7 pts. per acre. Do not use on direct-seeded plants. May be broadcast, banded, or drip-applied in the spring up to 7 days before planting at a depth of 8 inches. Effectiveness is reduced on muck and clay soils. REI: 12-hour. IRAC UN. Telone C-17 (L) (1,3-dichloropropene, chloropicrin) Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | Muck soils: Use C-17 formulation at 27.4-30 gals. per acre, and C-35 formulation at 33-36 gals. per acre. Mineral soils: Use C-17 formulation at 10.8-17.1 gals. per acre, and C-35 formulation at 13-20.5 gals per acre. In the fall, when soil at 6 inches is above 50 F and moist, place Telone C-17 or C-35 about 8 inches beneath the surface through shank-injectors, or broadcast sprayers directly in front of tillage tools to bury it. Seal with soil packing, irrigation, or plastic. Or, in the spring, InLine may be applied through drip irrigation under unperforated plastic beds at 13- 20.5 gals. per acre, on mineral soils only. Before planting, allow product to dissipate for 1 week for every 10 gals. per acre plus 1 more week. REI: 3-5-day. IRAC UN, FRAC NC, IRAC 08B. RUP. Telone II (9.85L) (1,3-dichloropropene) Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | Muck soils: Use at 25 gals. per acre. Mineral soils: Use at 9-12 gals. per acre. In the spring or fall, when soil at 6 inches is above 50 F and moist, place Telone II about 8 inches beneath the surface through shank-injectors, or broadcast sprayers directly in front of tillage tools to bury it. Seal with soil packing or irrigation. Or, in the spring, Telone EC may be applied through drip irrigation under unperforated plastic beds at 9-18 gals. per acre on mineral soils only. Before planting, allow product to dissipate for 1 week for every 10 gals. per acre plus 1 more week. REI: 5-day. IRAC UN, FRAC NC. RUP. VAPAM HL (4.25L) (metam sodium) Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | 37.5-75 gals. per acre. Use high rates on muck, and lower rates on sands. In the fall, when soil at 6 inches is above 50 F and moist, place VAPAM HL or Sectagon K42 about 8 inches beneath the surface through shank-injectors, or broadcast sprayers directly in front of tillage tools to bury it. Seal with soil packing or irrigation. Or, in the spring, it can be applied through drip irrigation under unperforated plastic beds. Before planting, allow product to dissipate for 1 week for every 10 gals. per acre plus 1 more week. REI: 5-day. IRAC 08F, FRAC M03, HRAC NC. RUP. Velum Prime (4.16SC) (fluopyram) Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | 6.5-6.84 fl. oz. per acre. Apply through drip irrigation. Do not exceed 13.7 fl. oz. per acre per season. Allow 5 days between applications. REI: 12-hour. PHI: 0- day. FRAC 07. Vydate L (2WSL) (oxamyl) Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | Apply 1-2 gals. per acre as a banded or shank-injected pre-plant, at-plant in- furrow or directed post-plant soil treatment with at least 20 gals. water per acre incorporated 2-4 inches deep by water or mechanical means, or drip chemigate 2-4 pts. per acre after transplanting. Allow 14 days between applications. Do not exceed 8 total applications, or 3 gals. per acre per season. REI: 48-hour. PHI: 1-day. IRAC 01A. RUP. Phytophthora Blight of Multiple Crops - Phytophthora Oomycete Phytophthora may cause damping-off, vine infection, and fruit rot in cucurbits. It is often associated with heavy rains and fields with poor drainage. The first symptoms are usually observed in low areas. It has a wide host range of crops and weeds, including peppers, tomatoes, beans, nightshades and velvetleaf. Ponds and streams with run-off water from infested soil may be contaminated with Phytophthora. At planting, direct-seeded crops benefit from fungicide- treated seed (see discussion of fungicide seed treatment under Damping-off). Treat seed with Apron XL LS to help prevent Phytophthora infection for 5 weeks from time of seeding. At vine touch, apply contact or systemic fungicides at first sign of the disease. Systemic fungicides are available. At harvest, if you touch an infected fruit, disinfest your hands (using soap or ethanol) before touching an uninfected fruit. Do not place uninfected fruits on soil infested with Phytophthora. Non-Pesticide Cantaloupe/Muskmelon, Cucumber, Pumpkin, Squash, Watermelon | Avoid fields with a history of the disease and excess water. Improve drainage with raised beds. Reduce

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